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<div><h2 class="title">
<a name="tribool"></a>Chapter 20. Boost.Tribool</h2></div>
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<h3 class="author">
<span class="firstname">Douglas</span> <span class="surname">Gregor</span>
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<code class="email">&lt;<a class="email" href="mailto:dgregor%20-at-%20cs.indiana.edu">dgregor -at- cs.indiana.edu</a>&gt;</code>
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<div><p class="copyright">Copyright © 2002-2004 Douglas Gregor</p></div>
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<a name="id-1.3.21.1.3"></a><p>Use, modification and distribution is subject to the Boost
    Software License, Version 1.0. (See accompanying file
    <code class="filename">LICENSE_1_0.txt</code> or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</p>
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<p><b>Table of Contents</b></p>
<dl class="toc">
<dt><span class="section"><a href="tribool.html#tribool.introduction">Introduction</a></span></dt>
<dt><span class="section"><a href="tribool/tutorial.html">Tutorial</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="tribool/tutorial.html#id-1.3.21.4.2">Basic usage</a></span></dt>
<dt><span class="section"><a href="tribool/tutorial.html#id-1.3.21.4.3">Renaming the indeterminate state</a></span></dt>
<dt><span class="section"><a href="tribool/tutorial.html#id-1.3.21.4.4"><code class="computeroutput">tribool</code> input/output</a></span></dt>
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<dt><span class="section"><a href="tribool/reference.html">Reference</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="tribool/reference.html#doxygen.tribool_8hpp">Header &lt;boost/logic/tribool.hpp&gt;</a></span></dt>
<dt><span class="section"><a href="tribool/reference.html#doxygen.tribool__fwd_8hpp">Header &lt;boost/logic/tribool_fwd.hpp&gt;</a></span></dt>
<dt><span class="section"><a href="tribool/reference.html#doxygen.tribool__io_8hpp">Header &lt;boost/logic/tribool_io.hpp&gt;</a></span></dt>
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<dt><span class="section"><a href="tribool/tests.html">Testsuite</a></span></dt>
<dd><dl><dt><span class="section"><a href="tribool/tests.html#tribool.tests.acceptance">Acceptance tests</a></span></dt></dl></dd>
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="tribool.introduction"></a>Introduction</h2></div></div></div>
<p>The 3-state boolean library contains a single class,
    <code class="computeroutput"><a class="link" href="doxygen/classboost_1_1logic_1_1tribool.html" title="Class tribool">boost::logic::tribool</a></code>, along with
    support functions and operator overloads that implement 3-state
    boolean logic. </p>
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